diff --git a/src/lanes.ts b/src/lanes.ts
index 28cfb15..e267f10 100644
--- a/src/lanes.ts
+++ b/src/lanes.ts
@@ -36,15 +36,18 @@ export class LaneManager {
     const inflight = this.creating.get(key);
     if (inflight) return inflight;
     const promise = (async () => {
-      const session = await createSession(
-        this.deps,
-        { defaultDestination: key, defaultUserId: userId },
-        this.client
-      );
-      const lane: Lane = { session };
-      this.lanes.set(key, lane);
-      this.creating.delete(key);
-      return lane;
+      try {
+        const session = await createSession(
+          this.deps,
+          { defaultDestination: key, defaultUserId: userId },
+          this.client
+        );
+        const lane: Lane = { session };
+        this.lanes.set(key, lane);
+        return lane;
+      } finally {
+        this.creating.delete(key);
+      }
     })();
     this.creating.set(key, promise);
     return promise;